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Next: Comparison of Two ``Document Similarity Search Engines'' . ... A drawback of the current document representation scheme in the ADS abstract service is its heterogeneous subject indexing. ... Using lexical similarity alone, one out of six ADS descriptors can be automatically mapped to some other descriptor. ... Researchers at the University of Illinois were invited to investigate methods of merging the indexing languages in use in ADS, and any other methods of dealing with the heterogeneity. ...

... News . ... Read Mark BosloughУ?т??т??s blog on the Jupiter impact . ... New model reconciles the Moon's Earth-like composition with the giant impact theory of formation . ... However, a major challenge to the theory has been that Earth and the Moon have identical oxygen isotope compositions, even though earlier impact models indicated they should differ substantially. ... Only registered members of Astronomy.com are allowed to comment on this article. ... Oldest to newest . ... LATEST NEWS . ...

... Moon Phase below . ... ARTICLE: Why the moon always shows us the same face . ... Before you continue reading, you should know that this was not always the case, i.e. the Moon once was rotating with respect to the Earth, so that on every night a terrestrial observer (if there was one, because this was long, long before mankind appeared on our planet, and even before any major animals had appeared) saw another face of the Moon. ... Figure 1 (not to scale) shows how we can imagine the system Earth-Moon...